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boring out edelbrock 3704 tbi manifold

ive been searching on this topic and i see mixed answers about boring out this intake to 2". can you do this without running into water jacket? ive seen pictures on this site showing it done but others say differently. could the castings vary and some are ok and others are not ok?

I'm taking my block to the shop this coming up Monday and if i don't need to take my intake that would be great. I used measuring tape and it measures 2 inch across (50mm) but i have a feeling its not due to the fact that i lack some tools to properly measure it.

I dont think that u will actually need bigger bores and TB unless u want a big motor producing more than 300hp to the crank people say the stock TB with ultimate tbi mods will support up to 280 hp going bigger on a stock 305 or 350 tbi is just not worth it unless u want more horses than what the stock unit will support, i really dont see the point in the E. Performer TBI since in my opinion its a copy of the stock one that came on the engine already, im sure they flow pretty much the same.

how can there be a water jacket on the top mounting flange ???? I'm a machinist and don't understand this one.... at MOST you are only taking out .156 thousandths of an inch around the existing bores (holes) ?????????